It was an all too familiar story to those who study HIV. Kimberly Page, an epidemiologist at the University of California, San Francisco (UCSF), had just returned from Cambodia, where she had been conducting research on how to protect people from getting infected with the AIDS-causing virus.

Masturbation has long been considered a normal sexual behavior for children, and now the first nationally representative study of the practice finds — er, confirms — that teen boys, more so than girls, do it early and often.

When a pornographic-film performer tested positive for HIV at a Los Angeles porn clinic last October, it shined a light on the lack of oversight of the porn industry. In December, that clinic, which porn producers used to test …

It’s pretty obvious that for monogamy to work, both parties have got to be on the same page — which is why it’s useful to note that a new study found that’s not always the case. Researchers at Oregon State University …